zones, and the creation of major depositional basins through down-warping of the crust.
2.1n Many of Earth’s surface features such as mid-ocean ridges/rifts, trenches/subduction zones/island
arcs, mountain ranges (folded, faulted, and volcanic), hot spots, and the magnetic and age patterns in surface
bedrock are a consequence of forces associated with plate motion and interaction.
2.1p Landforms are the result of the interaction of tectonic forces and the processes of
weathering, erosion, and deposition.
2.1r Climate variations, structure, and characteristics of bedrock influence the development of landscape
features including mountains, plateaus, plains, valleys, ridges,
escarpments, and stream drainage patterns.
2.1t Natural agents of erosion, generally driven by gravity, remove, transport, and
deposit weathered rock particles. Each agent of erosion produces distinctive changes
in the material that it transports and creates characteristic surface features and landscapes. In certain erosional
situations, loss of property, personal injury, and loss of life can be reduced by effective emergency preparedness.
2.1u The natural agents of erosion include:
• Streams (running water): Gradient, discharge, and channel shape influence a stream’s velocity and the erosion
and deposition of sediments. Sediments transported by streams tend to become rounded as a result of abrasion.
Stream features include V-shaped valleys, deltas, flood plains, and meanders. A watershed is the area drained by
a stream and its tributaries.
• Glaciers (moving ice): Glacial erosional processes include the formation of U-shaped valleys, parallel scratches,
and grooves in bedrock. Glacial features include moraines, drumlins, kettle lakes, finger lakes, and outwash
plains.
• Wave Action: Erosion and deposition cause changes in shoreline features, including beaches, sandbars, and
barrier islands. Wave action rounds sediments as a result of abrasion. Waves approaching a shoreline move sand
parallel to the shore within the zone of breaking waves.
• Wind: Erosion of sediments by wind is most common in arid climates and along shorelines. Wind-generated
features include dunes and sand-blasted bedrock.
• Mass Movement: Earth materials move downslope under the influence of gravity.
2.1v Patterns of deposition result from a loss of energy within the transporting system
and are influenced by the size, shape, and density of the transported particles. Sediment
deposits may be sorted or unsorted.
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Teacher overview.pdf Benjamin Rosenthal,
v.1
Page 2 of 2Teacher Page - NYS Landforms
7/8/2012https://sites.google.com/site/nyslandforms/teacher-page?previewAsViewer=1